Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf258e36540a9c3…

MALICIOUS

PDF

94.3 KB Created: 2021-03-18 20:36:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61adfb4c798c002a5e04ebabbdc9de1a SHA-1: 2c6c0feb94945a221b039b7828f905ca8d25e857 SHA-256: ccf258e36540a9c33ac57bb5a3ab5e9732b8fbe20d75c6d4400392bf9fafc54e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/wix?keyword=ksp+manual+fuel+transfer
    • https://mumetimobenuja.weebly.com/uploads/1/3/2/3/132302956/173019.pdf
    • https://nizidisifa.weebly.com/uploads/1/3/4/5/134505067/nekizizozelit_jomigoxoduvi_dupivodu.pdf
    • http://skidki-day.shop/samsung_uhd_tv_6290_40_inchg9igx.pdf
    • http://kagaromorin.medianewsonline.com/suzilan.pdf
    • http://fogafiv.mypressonline.com/xarivedetofa.pdf
    • http://meetraisins.club/87385369208mni6h.pdf
    • https://vujewixijul.weebly.com/uploads/1/3/1/4/131437312/fepibetaxovewa.pdf
    • https://jawoxaze.weebly.com/uploads/1/3/0/9/130968973/2097349.pdf
    • https://ninefajesazaga.weebly.com/uploads/1/3/5/3/135384029/pabovovewujut.pdf
    • http://wdd13.ru/tivejemesuwawusu05aqj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lofese/assamese_baganiya_video_songs_free.pdf
    • https://s3.amazonaws.com/zevutebulaworel/97633008206.pdf
    • https://s3.amazonaws.com/tikoweravisixu/decrypt9_3ds_guide.pdf
    • https://s3.amazonaws.com/tuxenipup/wemivefenupetovi.pdf
    • https://s3.amazonaws.com/jixeremipet/layout_template_indd.pdf
    • https://s3.amazonaws.com/dafumuxitupav/billie_eilish_bellyache_sheet_music.pdf
    • https://s3.amazonaws.com/vuliwisuwig/bonusawaxowufat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001366a.bin
7f82a47c57498124ae2be56c293d2e2fc3406a47e6050e346ae19a999f79ddce
pdf-font-stream PDF embedded font (sfnt) at offset 0x1366A 5016 bytes
font_01_sfnt_off00014765.bin
ffbcc2645ceb91a2205103a7c3a4e8fb873fb390f89858b33f84cf23d029dbde
pdf-font-stream PDF embedded font (sfnt) at offset 0x14765 11128 bytes